Synthesis of pyrimido[2,1-<i>a</i>]isoindolone and isoindolo[2,1-<i>a</i>]quinazolinone <i>via</i> intramolecular aza-Prins type reaction
作者:Subhamoy Biswas、Bikoshita Porashar、Pallav Jyoti Arandhara、Anil K. Saikia
DOI:10.1039/d1cc04554g
日期:——
A novel aza-Prins type cyclization reaction involving N-acyliminium ions and amides is reported for the synthesis of tetrahydropyrimido[2,1-a]isoindole-2,6-dione and 6,6a-dihydroisoindolo[2,1-a]quinazoline-5,11-dione derivatives in excellent yields. The strategy features inexpensive reagents, mild reaction conditions, and metal-free synthesis of N-heterocyclic frameworks. Further, post-synthetic modification
涉及一种新颖氮杂普林斯型环化反应Ñ -acyliminium离子和酰胺被报告四氢嘧啶并[2,1-的合成一个]异吲哚-2,6-二酮和6,6-一个-dihydroisoindolo [2,1-一个]喹唑啉-5,11-二酮衍生物,产率极好。该策略的特点是试剂价格低廉,反应条件温和,N-杂环骨架的无金属合成。此外,合成后的修饰导致其前所未有的三唑、四环二氮杂环戊二烯[ def ]菲-1,4(9 a 1 H )-二酮和羰基衍生物的形成。